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His film "Searching for Sugar Man" also won several other prizes, including a British BAFTA for best documentary and the Swedish Guldbagge award.

Updated at 9:01 PM EDT on Wednesday, May 14, 2014

Malik Bendjelloul, the Swedish director of the acclaimed "Searching for Sugar Man" documentary, was widely known for his enthusiasm, kindness and high spirits — so the news Wednesday that he had taken his own life shocked colleagues around the world.

Bendjelloul's brother Johar Bendjelloul confirmed to The Associated Press that his 36-year-old younger brother killed himself Tuesday. He told daily Aftonbladet that his brother had struggled with depression for a short period.

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"Life is not always simple," Johar Bendjelloul was quoted as saying, adding that receiving the message that his brother had killed himself was the worst thing he had ever experienced.

"I don't know how to handle it. I don't know," he said.

Police would not comment on the cause of death but said they suspected no foul play.

Bendjelloul rose to international fame in 2013 when his debut feature film, "Searching for Sugar Man," won an Oscar for best documentary. The film tells the story of Detroit-based singer-songwriter Sixto Rodriguez, who had flopped in the United States but became a superstar in apartheid-era South Africa without even knowing about it.

"He made a great film and will be missed," U.S. documentary film maker Michael Moore wrote on Twitter.

British film producer Simon Chinn, who produced "Searching for Sugar Man," said he was shocked and deeply saddened by the news of his friend's passing.

"It seems so unbelievable," Chinn told the AP over the telephone. "He had everything to live for."

Chinn said he saw Bendjelloul only two weeks ago in London.

"He was so full of life, hope and optimism and happiness, and looking forward to the future and future collaborations," he said. "The idea that he is no longer is just too hard to process."

The soft-spoken Bendjelloul worked as a reporter for Sweden's public broadcaster SVT before resigning to backpack around the world. He got the idea for "Searching for Sugar Man" during one of his trips, but it would take him more than four years to complete the film.

He reached out to Chinn when the film was 90 percent finished, but his main sponsor had withdrawn support, saying the film was lousy.

"He just kind of came in with his bounce of enthusiasm and charm and smiling eyes and I was completely won over by him," Chinn recalled Wednesday.

"He had found this amazing story and was completely determined to do it justice," he said. "The fact that no one else believed in it didn't seem to deter him, he just kind of pursued it with incredible passion and tenacity that I hadn't really ever seen before in a filmmaker."

SVT's culture chief Eva Beckman said Bendjelloul's death was incomprehensible and praised his strong storytelling skills and his willingness to experiment with new formats.

"What really set him apart from everybody else was his passion for storytelling. He was a fantastic storyteller," she said.

In "Searching for Sugar Man," Bendjelloul detailed how Rodriguez had developed a cult following among white liberals in South Africa who were inspired by his songs protesting the Vietnam War, racial inequality, the abuse of women and social mores.

They came to believe that Rodriguez had died a bitter death, but it wasn't until after the end of apartheid and the advent of the Internet that they realized he was alive. The film followed the quest of Cape Town record store owner Stephen Segerman and journalist Carl Bartholomew-Strydom as they set out to determine Rodriguez's fate. They found him living in obscurity and working on construction sites in Detroit, and brought him to South Africa for a triumphant concert tour.

Segerman said Wednesday it was difficult to accept the death of Bendjelloul, who he said was a "really, really lovely, charming human being" who appeared happy.

"He was like Tintin," Segerman said, comparing the filmmaker to the globe-trotting character from Herge's comic books.

He praised Bendjelloul's ability to persuade people, including the reclusive Rodriguez, to talk to him for his documentary.

The film's Oscar win led to a career rebirth for Rodriguez, who has been touring major venues in the U.S. and introducing American audiences to the songs he wrote four decades ago.

Rodriguez told Billboard magazine Tuesday night that the death was "a shock. I just found out about it a couple of hours ago. He was a very talented man and hard-working artist — he proved it by hitting an Academy Award his first time out. My deepest condolences to his family. Rest in peace."